Mitra Pratip, Reddy Gade Priyanka, Srivastava Saurabh, Salunkhe Sandip Shantaram, Kumari Anisha, Gavas Sanjay Ganpat, Ninawe Pruthviraj Ramkrishna, Thekkinkattil Mukundan, Garg Saurabh, Kumar Aerattukkara Vinod
Environmental Monitoring and Assessment Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
Homi Bhabha National Institute, Mumbai 400094, India.
Radiat Prot Dosimetry. 2023 Dec 29;200(1):75-83. doi: 10.1093/rpd/ncad267.
The Indian Environmental Radiation Monitoring Network continuously monitors the outdoor natural gamma absorbed dose rate in air at different locations throughout India by employing Geiger-Mueller (GM) detector-based field-installed environmental radiation monitors (ERMs). Hyderabad, Telangana, India is known to have high natural background radiation levels due to the presence of high concentrations of primordial radionuclides in its granitic rocks. There are a total of 59 ERMs installed at various locations across Hyderabad. Long-term monitoring data of these locations are presented in this paper. The mean values of outdoor natural gamma absorbed dose rate in air at the monitoring locations were found to vary in the range of 104-258 nGy.h-1 with a mean of 193 ± 40 nGy.h-1. The mean annual effective dose due to outdoor natural gamma radiation was estimated to be 0.24 ± 0.05 mSv.y-1. Analysis of the long-term seasonal variation of outdoor natural gamma absorbed dose rate in air showed that the same was lowest during monsoons.
印度环境辐射监测网络通过使用基于盖革 - 米勒（GM）探测器的现场安装环境辐射监测器（ERM），持续监测印度各地不同地点空气中的室外天然伽马吸收剂量率。由于印度特伦甘纳邦海得拉巴的花岗岩中存在高浓度的原生放射性核素，该地区已知具有较高的天然本底辐射水平。海得拉巴各地共安装了59个ERM。本文展示了这些地点的长期监测数据。监测地点空气中室外天然伽马吸收剂量率的平均值在104 - 258 nGy.h-1范围内变化，平均值为193 ± 40 nGy.h-1。据估计，室外天然伽马辐射导致的年平均有效剂量为0.2 ± 0.05 mSv.y-1。对空气中室外天然伽马吸收剂量率长期季节性变化的分析表明，季风期间该剂量率最低。
